I will also check the fuel pump push rod, if it looks ok is there a way of servicing it i.e grease etc.
My engine is injected, so no hands on knowledge of the mechanical pump, but Haynes says 'Pack the fuel pump insulating block with grease'
There is a gasket below and another above the insulating block.
Re carb gasket, Simon Baxter at Brickwerks does a carb rebuild kit,
http://www.brickwerks.co.uk/index.php?p ... t&Itemid=6" onclick="window.open(this.href);return false;
Mike